Chemical and Physical Properties
Wollastonite’s unique chemistry and acicular (needle-shaped) physical structure make it one of the world’s most versatile and effective value-added performance materials.
| CHEMICAL COMPOSITION | |||
| COMPONENT |
Lewis Mine, New York Typical Value (%) |
Pilares Mine, Mexico Typical Value Wet Process (%) |
Pilares Mine, Mexico Typical Value Dry Process (%) |
| CaO | 46.36 | 44.94 | 45.72 |
| SiO2 | 51.60 | 52.94 | 46.52 |
| Fe2O3 | 0.77 | 0.28 | 0.25 |
| Al2O3 | 0.40 | 0.30 | 0.25 |
| MnO | 0.15 | 0.04 | 0.02 |
| MgO | 0.15 | 0.75 | 0.71 |
| TiO2 | 0.05 | 0.05 | 0.05 |
| K2O | 0.02 | 0.23 | 0.20 |
| Wt. Loss (1000˙C) | 0.50 | 0.47 | 6.30 |
| TYPICAL PROPERTIES | VALUE |
| APPEARANCE | WHITE |
| MORPHOLOGY | ACICULAR |
| MOLECULAR WEIGHT | 116 |
| SPECIFIC GRAVITY | 2.9 |
| REFRACTIVE INDEX | 1.63 |
| pH (10% SLURRY) | 9.9 |
| WATER SOLUBILITY (g/100cc) | 0.0095 |
| DENSITY (lbs./cu.ft.) | 181 |
| BULKING VALUE (gal./lbs.) | 0.0413 |
| MOHS HARDNESS | 4.5 |
| COEFFICIENT OF EXPANSION (mm/mm/˙C) | 6.5 X 10-6 |
|
MELTING POINT (˙C) - theoretical MELTING POINT (˙C) - by ASTM D1857 |
1540 1410 |